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| author | Christian Brauner <brauner@kernel.org> | 2026-02-16 16:31:57 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2026-02-23 15:06:38 +0300 |
| commit | 94d709be8c0dc875dfc9ebb64d3b8093d0790c15 (patch) | |
| tree | 0c8ac990b75854bc6023cd92747da0548cd2c73b /include | |
| parent | 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f (diff) | |
| download | linux-94d709be8c0dc875dfc9ebb64d3b8093d0790c15.tar.xz | |
xattr: add rcu_head and rhash_head to struct simple_xattr
In preparation for converting simple_xattrs from rbtree to rhashtable,
add rhash_head and rcu_head members to struct simple_xattr. The
rhashtable implementation will use rhash_head for hash table linkage
and RCU-based lockless reads, requiring that replaced or removed xattr
entries be freed via call_rcu() rather than immediately.
Add simple_xattr_free_rcu() which schedules RCU-deferred freeing of an
xattr entry. This will be used by callers of simple_xattr_set() once
they switch to the rhashtable-based xattr store.
No functional changes.
Link: https://patch.msgid.link/20260216-work-xattr-socket-v1-1-c2efa4f74cb7@kernel.org
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/xattr.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/xattr.h b/include/linux/xattr.h index 296b5ee5c979..fdbd2095414a 100644 --- a/include/linux/xattr.h +++ b/include/linux/xattr.h @@ -16,6 +16,7 @@ #include <linux/types.h> #include <linux/spinlock.h> #include <linux/mm.h> +#include <linux/rhashtable-types.h> #include <linux/user_namespace.h> #include <uapi/linux/xattr.h> @@ -112,6 +113,8 @@ struct simple_xattrs { struct simple_xattr { struct rb_node rb_node; + struct rhash_head hash_node; + struct rcu_head rcu; char *name; size_t size; char value[] __counted_by(size); @@ -122,6 +125,7 @@ void simple_xattrs_free(struct simple_xattrs *xattrs, size_t *freed_space); size_t simple_xattr_space(const char *name, size_t size); struct simple_xattr *simple_xattr_alloc(const void *value, size_t size); void simple_xattr_free(struct simple_xattr *xattr); +void simple_xattr_free_rcu(struct simple_xattr *xattr); int simple_xattr_get(struct simple_xattrs *xattrs, const char *name, void *buffer, size_t size); struct simple_xattr *simple_xattr_set(struct simple_xattrs *xattrs, |